<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 声明对象
        const school = {
            name: "北大",
            citys: ['北京', '上海', '深圳'],
            subjects: ['语文', '数学', '英语']
        }
        // 获取对象所有的键
        console.log(Object.keys(school));//['name', 'citys', 'subjects']
        // 获取对象所有的键
        console.log(Object.values(school));//['北大', Array(3), Array(3)]
        // entries
        console.log(Object.entries(school));//[Array(2), Array(2), Array(2)]
        // 创建Map
        const m = new Map(Object.entries(school));
        console.log(m);
        // 对象属性的描述对象
        console.log(Object.getOwnPropertyDescriptors(school));

        const obj = Object.create(null,{
            name:{
                // 设置值
                value:'清华',
                // 属性的特性
                writable:true,
                configurable:true,
                enumerable:true
            }
        })
    </script>
</body>

</html>